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Parasitization of monkey goby, Neogobius fluviatilis (Pallas, 1814) (Actinopterygii: Gobiidae), at localities with different salinity levels

Kvach Y., Ondračková M., Trichkova T., Drobiniak O., Zamorov V., Jurajda P.

Oceanological and Hydrobiological Studies

2018

Vol. 47, No. 4

376--383

Parasitism of monkey goby, Neogobius fliviatilis, was assessed at three brackish water localities with different salinity levels (Gulf of Odessa, Khadzibey Estuary, Lake Kytay) and one freshwater site along the Lower Danube River (Vidin). A total of 25 parasite taxa were identified, with minimum parasite richness recorded in the Khadzhibey Estuary (three species) and the maximum along the Lower Danube (11 species). Parasite richness in the mesohaline Gulf of Odessa and oligohaline Lake Kytay was lower, but still relatively high compared to the Khadzibey Estuary. Our study indicates that freshwater populations of monkey goby host richer and more abundant parasite communities than those inhabiting brackish waters with (more or less) stable salinity. Unstable abiotic conditions that probably affected the parasite’s intermediate hosts contributed to the reduction in parasite species in the estuarine zone of the Danube.

Feeding preferences of the round goby Neogobius melanostomus and mushroom goby Neogobius cephalarges in the Odessa Bay

Kvach Y., Zamorov V.

Oceanological Studies

2001

Vol. 30, No. 3-4

91-101

Feeding preferences of the round goby and mushroom goby from the Odessa Bay (areas with civil engineering works) were studied. Two goby species were observed to choose different dietary items in dependence of the season and place of fishery. The mushroom goby chose Nereis succinea more intensively than the round goby.